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TB-500, by contrast, distributes systemically
Vitamin B12 Methylcobalamin tablets form is the most bioactive and bioavailable form which means it is the most readily absorbed by the body giving 5X better results than any other form
Although studies suggest all three forms are well absorbed, better retention appears to be achieved with the natural forms of vitamin B12
The headaches seem to follow a different pattern (from what I remember) and tend to lessen over time - I had problems with headaches when I started using methyl but (nasal rather than injection) but it went away after a week or so
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